Helmi S. Politeness Strategies Found in Classroom Interaction Post-Graduate Student. Modal. J.: Int. J. Linguist. Lit. [Internet]. 2022 Jun. 30 [cited 2026 Mar. 12];2(1):16-2. Available from: https://ejournal.uinbukittinggi.ac.id/index.php/modality/article/view/5602